Anchor



if. ll

till

one end of the ancho1` plate l. Said head 47 also has a lug 53 formedthereon adapted to engage an opening 55 in said plate l. The tolerancesare such that the head 47 may be applied to an anchor plate in a mannersuch that the portion i9 engages the notch 5l While the lug enters theopening 55. By this means the anchor plate may he held at some'lengthfrom the operator.

The operation required tor installing the anchor is as Jfollows:

A hole 5T of suitable bore is drilled into the earth in a directionsubstantially at right angles to the direction which the anchor rod 5 isto maintain. After this the anchor rod is provided with a nut 33 and thepilot head 35 applied. The tines 39 (which are slightly longer than thedepth ot the nut 33) are then slightly turned over the end of the nut byapplying hammer blows thereto.

Neat, the anchor rod with its pilot head, is driven into the surface ofthe ground substantially at right angles to said hole `57 and directlytoward the said hole (see Fig. l). The driving is continued until thepilot and nut extend some distance out into the hole.

After this the anchor has the installing bar lt3 applied thereto and islowered into the hole With its convex side toward the pilot 35, that is,with the trap arms 7 on the under side. The opening 3 of the anchorplate is positioned beneath the point 37 of the pilot 35 (see dottedlines Fig. l). Then the anchor plate is pushed laterally of the hole 57in such a manner that the pilot 35 enters the opening 3, engages theupper tace 19 ot the trap arms 7 (thereby pushing them open), passesthrough said trap arms, and when the anchor plate touches the side o'ithe hole 57 the trap arms spring shut (see solid lines Fig. l). Thismeans that the opening Q3 now surrounds the anchor rod 5 (see Fig. 3).

The installing bar 43 may noiv be released and the anchor rod 5 drawnupwardly until the upper ends ot the tines 39 engage the lower surfacesof the trap arms 7 and are socleted in socket 25. A slight twist of theanchor plate or oi' the anchor rod 5 may be required to align the pilotin the socket.

llhen a substantially longitudinal strain is put on the anchor rod 5 thetendencyr is to .draw the nut 33 i'rom the pilot 35, Whereby the tines3.9 may or may not be spread apart, depending upon the magnitude of thestrain. ln either case the anchor rod 5 is prevented from pulling outbecause either the tines 39 (it they do not expand) or the nut 33 engagethe rim of the opening 23 to prevent Withdrawal of the anchor rod 5. OItis evident that the arms 7 trap and prevent return ol the nut 33. lso,when Vthe strain comes on the anchor rod 5, the upper end ot the opening3 and the ribs 59 on the convex suriace o'l the anchor plate gouge intothe earth to hold the anchor in place. The hole 5T is then filled in.

It is evident from the above that only a negligible percentage oi theconvex holding area oit the anchor plate is used in permitting passageot the anchor rod The result is a better holdingl power l'or thisanchor. The pilot' is generally not 'retrieved T from the hole 5T beforeclosing the hole, as .it hangs in the suchet 25 and on the nut ltsintrinsic value is low so that this ,feature is no disadvantage. it,before or atter the hole 5'? is iilled With earth, it is desired toretrieve thc Vwhole anchor, this may be readily lone without digging upthe anchor rod 5. This is because the anchor rod 5 may at any time beurn-:crewed iroin a point on the surface of the earth, therebyunloosening the nut 33. 'lhe anchor rod 5 may then be withdrawn and theanchor plate and pilot dug out or li'rted. lr it is desired to preventunscrewing oit' the anchor rod t'rem the nut 33, this can be done byriveting or bui-ring Je over the end of the thread on the rod after thenut. has been applied. Under certain circumstances this is desirable.The operation is simple and can be performed Without the use of anyextra parts.

n view ol the above, it will be seen that the several objects of theinvention are achieved and other advantageous results attained.

its many changes could be made in carry- 10D ing out the aboveconstructions without departing from the scope of the invention, it isintended that all matter contained :in the above description or shown inthe accompanying drawings shall be interpreted as illustrative and notin a limiting sense.

.l claim:

l. An anchor adapted to be. used with a headed anchor rod, comprising anancho;1 plate, an opening therethrough, separate 11n trap arms hingedadjacent to said opening to substantially close it except at an openingbetween said arms adapted to accommodate said anchor rod, and means forrcsiliently holding the trap arms against said tirstnamed opening,whereby the passage ot the head on the anchor rod is accommodated in onedirection but not in the reverse direction, after the anchor rod ispositioned in said second opening between the arms.

2. A anchor comprising an anchor plate, an opening in said plate, traparmsA adjacent the opening` and cooperating therewith to permit thepassage of the headed end o'lf an anchor rod in. one direction but notin the reverse direction and a socket behind said trap arms fornon-rotatably engaging the headed end ot' said anchor rod.

3. An anchor comprising an anchor plate, an opening therethrough, traparms hinged adjacent said openingl and resilient-ly held thereto, ananchor rod having,` a nut thereon forming` a head, a pilot adapted topermit driving said rod through the earth, said piloted rod beingadapted to open the trap arms in one direction, said trap armspreventing a return of the headed rod, and a socket formed with saidarms, adapted to cntold the pilot as the trap arms close to prevent saidreturn.

el. Ein anchor comprisingl an anchor plate, an opening` in said plate,trap arms hinged adjacent the opening and cooperatingl therewith topermit the passage ot the headed end of an anchor rod in one directionbut not in the reverse direction, said trap arms being,l formedseparately from the plate and havingspring means associated therewithadapted to said arms into a position for preventing said reversepassage.

An anchor comprisingY an anchor plate adapted to he used with a headedanchor rod, said anchor plate having` an opening therein, trap armshinged adjacent the opening; to snhstantiall;7 close it except at anopeningl between said arms adapted to accon'iniodate said anchor rod.said trap arms being` formed se 'iarately from the plate and having'spring means reacting from said anchor plate to said arms to set saidarms into a position whereby reverse niovement of the head ot said rodis prevented.

6. an anchor comprising an anchor plate adapted to be used with a headedanchor rod, said anchor plate havingan opening therein, trap arms hingedadjacent the opening,I to substantially close it except at an openin`between said arms adapted to ac commodate said anchor rod, said traparms being formed sepa atel7 from the plate and having spring` meansreacting' from said anchoring plate to said arms to set said arms into aposition whereby reverse movement of the head ot said rod is preventedand a socket formed to the rear of said trap arm adapted to engage thehead of said anchor to prevent it from turning.

7. An anchor comprising an anchor plate, an anchor rod having` anenlarged head of predetermined form thereon which is adapted to heremoved by turning', said anchor plate having an opening therein adaptedto accommodate passage ot said head, trap arms hinged adjacent theopening to substantially close it excepty at an opening between saidarms which is adapted to accommodate said anchor rod, means forresilientlv holdingl the trap arms apjainst said firstnamed opening,whereby the passage of said head is accommodated in one direction butnot in the reverse direction after the anchor rod is positioned in saidsecond opening` betiveen the arms and a socket formed on the rear ofsaid tra-p arms adapted to engage said head for preventing turningthereof,

ln testimony whereof, I have signed my name to this specification this14th day of August, 1926.

THEODORE BIRKENMAIER.

